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    <p>I guess that you <em>really</em> verified that the <code>SelectedItem</code> has changed (you could set the <code>Binding</code> Mode to <code>TwoWay</code> temporarily to see if it works the other way round, by clicking the row you should see the highlight and <code>SelectedItem</code>'s <code>set</code>-method executed). If yes, verify that you <em>really</em> exactly match the Property Name on <code>PropertyChanged</code> method invoke. Since you're not typesafe here, you might have made a spelling error. If no, check if your Databinding Attribute is set correctly. Another idea is that you might have changed the <code>DataGrid</code>'s styles or template and now you are missing some of the <strong>Visual States</strong>. The <code>DataGridRow</code> can be styled using a style template. You have three selected states, called <code>UnfocusedSelected</code> (probably the right one), <code>NormalSelected</code> and <code>MouseOverSelected</code>.</p> <p>You could try to make your own Visual State by using this template:</p> <pre><code>&lt;Style TargetType="local:DataGridRow"&gt; &lt;Setter Property="IsTabStop" Value="False" /&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="local:DataGridRow"&gt; &lt;localprimitives:DataGridFrozenGrid Name="Root"&gt; &lt;vsm:VisualStateManager.VisualStateGroups&gt; &lt;vsm:VisualStateGroup x:Name="CommonStates"&gt; &lt;vsm:VisualState x:Name="Normal"/&gt; &lt;vsm:VisualState x:Name="NormalAlternatingRow"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="0"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;vsm:VisualState x:Name="MouseOver"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To=".5"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;vsm:VisualState x:Name="NormalSelected"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;vsm:VisualState x:Name="MouseOverSelected"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;vsm:VisualState x:Name="UnfocusedSelected"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/&gt; &lt;ColorAnimation Duration="0" Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="(Fill).Color" To="#FFE1E7EC"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;/vsm:VisualStateGroup&gt; &lt;vsm:VisualStateGroup x:Name="ValidationStates"&gt; &lt;vsm:VisualState x:Name="Valid"/&gt; &lt;vsm:VisualState x:Name="Invalid"&gt; &lt;Storyboard&gt; &lt;ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Visibility"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;DoubleAnimation Storyboard.TargetName="InvalidVisualElement" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;/vsm:VisualStateGroup&gt; &lt;/vsm:VisualStateManager.VisualStateGroups&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.Resources&gt; &lt;Storyboard x:Key="DetailsVisibleTransition"&gt; &lt;DoubleAnimation Storyboard.TargetName="DetailsPresenter" Storyboard.TargetProperty="ContentHeight" Duration="00:00:0.1" /&gt; &lt;/Storyboard&gt; &lt;/Grid.Resources&gt; &lt;Rectangle x:Name="BackgroundRectangle" Grid.RowSpan="2" Grid.ColumnSpan="2" Opacity="0" Fill="#FFBADDE9"/&gt; &lt;Rectangle x:Name="InvalidVisualElement" Grid.RowSpan="2" Grid.ColumnSpan="2" Opacity="0" Fill="#FFF7D8DB"/&gt; &lt;localprimitives:DataGridRowHeader Grid.RowSpan="3" Name="RowHeader" localprimitives:DataGridFrozenGrid.IsFrozen="True" /&gt; &lt;localprimitives:DataGridCellsPresenter Grid.Column="1" Name="CellsPresenter" localprimitives:DataGridFrozenGrid.IsFrozen="True" /&gt; &lt;localprimitives:DataGridDetailsPresenter Grid.Row="1" Grid.Column="1" Name="DetailsPresenter" /&gt; &lt;Rectangle Grid.Row="2" Grid.Column="1" Name="BottomGridLine" HorizontalAlignment="Stretch" Height="1" /&gt; &lt;/localprimitives:DataGridFrozenGrid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>This is a copy-paste from a good <a href="http://msdn.microsoft.com/en-us/library/cc278066%28v=VS.95%29.aspx" rel="nofollow noreferrer">MSDN Article</a> on customizing the DataGrid Styles. You could, for example, modify the <code>UnfocusedSelected</code> part of the template and see if you see any change when, for example, adding a red border around it or something.</p> <p>Maybe it's worth a try. I hope that you know how to apply own styles. If not, here is another <a href="http://msdn.microsoft.com/en-us/library/cc189093(v=VS.95).aspx" rel="nofollow noreferrer">MSDN Resource</a>.</p> <p>I know, these are just tips, but maybe helpful at last.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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